61
Page
WARNING
•
To set pump operation for freeze protection, adjust only the No. 4 DIP
switch in the UPPER bank of DIP switches. (See below.) DO NOT adjust the
other DIP switches.
•
Turn off the power supply to the water heater before changing the DIP
switch settings.
•
Failure to observe these warnings could lead to carbon monoxide poison-
ing, severe personal injury, or death.
•
There are two systems for freeze protection in the water heater-
heating block system
and
recircula-
tion system
with the integrated pump.
•
This water heater comes equipped with heating blocks to protect the unit against damages associated
with freezing. When the freeze protection thermostat senses air temperature below 36.5
°F
(2.5
°C
),
the blocks will heat up to prevent freezing of the unit.
•
T
his water heater can recirculate the water in the pipes installed in the recirculation system with the
integrated pump to prevent freezing. When the integrated thermistors detect water temperature below
50
°F
(10
°C
)
,
the pump will activate and recirculate the water in the recirculation line.*
•
To operate these freeze protection systems, there has to be electrical power to the unit. Damage
to the heat exchanger caused by freezing temperatures due to power loss is not covered under the
warranty. In cases where power losses can occur, consider the use of a backup power supply.
•
In any areas subject to freezing temperatures, the manufacturer highly recommends an indoor installa-
tion with an indoor model.
•
The manufacturer also highly recommends the use of a backflow preventer (sold separately) to mini-
mize the amount of cold air entering through the exhaust venting when the water heater is off.
•
It is the installer’s responsibility to be aware of freezing issues and take all preventative measures. The
manufacturer will not be responsible for any damage to the heat exchanger as a result of freezing.
•
If you will not be using your heater for a long period of time:
1.
Completely drain the water out of the unit. Refer to p. 63.
2.
Disconnect power to your heater.
This will keep your unit from freezing and being damaged.
*Recirculation system for freeze protection is only activated when the built-in/remote controller is off.
When the integrated thermistors detect the water temperature above 52 °F (11 °C) over five minitues,
the operation is deactivated. If you want to stop the recirculation system for freeze protection, change
the DIP switch setting below.
Pump operation
for freeze protection
Active
Inactive
1
2
3
4
ON
No.4 : OFF
1
2
3
4
ON
No.4 : ON
DEFAULT
Middle bank
of DIP switches
Lower bank of
DIP switches
Upper bank of
DIP switches
Normal Operation
Owner's Guide
FREEZE PROTECTION SYSTEM
Only pipes within the water heater are protected by the freeze protection system. Any
water pipes (hot or cold) located outside the unit will not be protected. Properly protect
and insulate these pipes from freezing.
NOTICE
